<template>
  <div class="app-container">

    <!-- 添加章节按钮 -->
    <div>
      <el-button type="primary" @click="addChapter()">添加章节</el-button>
    </div>

    <!-- 章节列表 -->
    <ul class="chapterList">
      <li
        v-for="chapter in chapterList"
        :key="chapter.id">
        <p>
          {{ chapter.title }}
          <span class="acts">
            <el-button type="text" @click="addVideo(chapter.id)">添加课时</el-button>
            <el-button type="text" @click="editChapter(chapter.id)">编辑</el-button>
            <el-button type="text" @click="removeChapterById(chapter.id)">删除</el-button>
          </span>
        </p>
        <!-- 视频 -->
        <ul class="chapterList videoList">
          <li
            v-for="video in chapter.children"
            :key="video.id">
            <p>
              {{ video.title }}
              <el-tag v-if="!video.videoSourceId" size="mini" type="danger">
                {{ '尚未上传视频' }}
              </el-tag>
              <span class="acts">
                <el-tag v-if="video.isFree" size="mini" type="success">{{ '免费观看' }}</el-tag>
                <el-button type="text" @click="editVideo(chapter.id, video.id)">编辑</el-button>
                <el-button type="text" @click="removeVideoById(video.id)">删除</el-button>
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>
    <!-- 章节表单对话框 -->
    <chapter-form ref="chapterForm" />
    <!-- 课时表单对话框 -->
    <video-form ref="videoForm" />
    <div style="text-align:center">
      <el-button type="primary" @click="prev()">上一步</el-button>
      <el-button type="primary" @click="next()">下一步</el-button>
    </div>
  </div>
</template>
<script>
    import chapterApi from '@/api/vod/chapter'
    import videoApi from '@/api/vod/video'

    // 引入组件
    import ChapterForm from '@/views/vod/course/components/Chapter/Form'
    import VideoForm from '@/views/vod/course/components/Video/Form'

    export default {
        // 注册组件
        components: { ChapterForm, VideoForm },
        data() {
            return {
                chapterList: [] // 章节嵌套列表
            }
        },
        created() {
            this.fetchNodeList()
        },
        methods: {
            // 获取章节小节数据
            fetchNodeList() {
                chapterApi.getNestedTreeList(this.$parent.courseId).then(response => {
                    this.chapterList = response.data
                })
            },
            //删除章节
            removeChapterById(chapterId) {
                this.$confirm('此操作将永久删除该章节，是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).then(() => {
                    return chapterApi.removeById(chapterId)
                }).then(response => {
                    this.fetchNodeList()
                    this.$message.success(response.message)
                }).catch((response) => {
                    if (response === 'cancel') {
                        this.$message.info('取消删除')
                    }
                })
            },
            // 添加章节
            addChapter() {
                this.$refs.chapterForm.open()
            },
            // 编辑章节
            editChapter(chapterId) {
                this.$refs.chapterForm.open(chapterId)
            },
            // 添加课时
            addVideo(chapterId) {
                this.$refs.videoForm.open(chapterId)
            },
            // 编辑课时
            editVideo(chapterId, videoId) {
                this.$refs.videoForm.open(chapterId, videoId)
            },
            // 删除课时
            removeVideoById(videoId) {
                this.$confirm('此操作将永久删除该课时, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).then(() => {
                    return videoApi.removeById(videoId)
                }).then(response => {
                    this.fetchNodeList()
                    this.$message.success(response.message)
                }).catch((response) => {
                    if (response === 'cancel') {
                        this.$message.info('取消删除')
                    }
                })
            },
            // 上一步
            prev() {
                this.$parent.active = 0
            },
            // 下一步
            next() {
                this.$parent.active = 2
            }
        }
    }
</script>
<style scoped>
  .chapterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .chapterList li{
    position: relative;
  }
  .chapterList p{
    float: left;
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #DDD;
  }
  .chapterList .acts {
    float: right;
    font-size: 14px;
  }

  .videoList{
    padding-left: 50px;
  }
  .videoList p{
    float: left;
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dashed #DDD;
  }
</style>
